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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>isEmptyObject — Object.keys</title>

</head>

<body>

  <pre id="out"></pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      var empty = {};

      var filled = { id: 1 };

      document.getElementById("out").textContent = [

        "empty isEmptyObject: " + $.isEmptyObject(empty),

        "empty keys: " + (Object.keys(empty).length === 0),

        "filled isEmptyObject: " + $.isEmptyObject(filled),

        "filled keys: " + (Object.keys(filled).length === 0)

      ].join("\n");

    })();

  </script>

</body>

</html>

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jQuery.isEmptyObject() — vs Object.keys (Try It)